17_32_96_13_Groundwater_Transplanting_-_Amendment_0003_0003.pdf

NATIONAL PARK SERVICE

REHABILITATION OF THE EIELSON VISITOR CENTER

DENALI NATIONAL PARK AND PRESERVE, ALASKA

SECTION 32 96 13

GROUNDCOVER TRANSPLANTING

Design Alaska, Inc. 32 96 13 - 1

PART 1 GENERAL

1.1 SCOPE: SECTION 32 96 13– GROUNDCOVER TRANSPLANTING

A. This section covers Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Tundra Soil.

2. Chipping and Stockpiling Material.

3. Installation Tundra Soil

4. Hydroseeding

B. Related Requirements:

1. Section 01 50 00 "Temporary Facilities and Controls" for temporary erosion- and sedimentation-control measures.

2. Section 31 20 00 "Earth Moving" for installation vegetative mats and stockpiled material

1.3 DEFINITIONS

A. Subsoil: Soil beneath the surface soil/ topsoil layers of a naturally occurring soil profile, typified by less than 1 percent organic matter and few soil organisms.

B. Surface Soil: Soil that is present at the top layer of the existing soil profile where organic materials and vegetation root zones are located. In undisturbed areas, surface soil is typically called "topsoil".

C. Tundra Soil: All soil from the top of the roof structure that has been thoroughly mixed with chipped existing tundra vegetation and roots. Made up of roots, stems, rhizomes and seeds.

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1.4 MATERIAL DISPOSAL

A. All trees with trunk diameter greater than 3 inches shall be limbed and bucked to 16-inch lengths and stacked for firewood at location to be identified by the Government.

B. All other vegetation, including tree and shrub limbs and branches not scheduled for salvage as vegetative soil or reclaimed Organic Cover, is to be shredded/chipped and disposed of at a location to be identified by the Government.

1.5 INFORMATIONAL SUBMITTALS

A. Existing Conditions: Documentation of existing trees and plantings, adjoining construction, and site improvements that establishes preconstruction conditions that might be misconstrued as damage caused by site clearing.

1. Use sufficiently detailed photographs or video recordings.

1.6 ACTION SUBMITTALS

A. Weed free certification must comply with

1.7 FIELD CONDITIONS

A. Do not commence site clearing operations until temporary erosion- and sedimentation-control measures are in place.

B. Soil Stripping, Handling, and Stockpiling: Perform only when the soil is dry or slightly moist.

PART 2 PRODUCTS

2.1 HYDROSEEDING

A. Seed to be provided by NPS.

B. Hydroseeding Fertilizer: Controlled release fertilizer to use with hydroseeding to provide a continuous release of nutrients for at least 6 months and containing the minimum percentages, by weight, of plant food as recommended by the soil test.

C. Fiber Mulch: Biodegradable, dyed-wood, cellulose-fiber mulch; nontoxic and free of plant-growth or germination inhibitors; with a maximum moisture content of 15 percent and a pH range of 4.5 to 6.5. Use recovered materials of either paper-based (100 percent) or wood based (100 percent).

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D. Nonasphaltic Tackifier: Colloidal tackifier recommended by fiber-mulch manufacturer for slurry application; nontoxic and free of plant-growth or germination inhibitors.

2.2 WEED FREE CERTIFICATION

A. Comply with the following requirements for weed-free certification of imported soils and aggregate materials:

1. Prior to import of soil or aggregate materials into the Park, proposed soil and aggregate material sources must be inspected by the Contracting Officer and determined to be free of prohibited plant species and seeds or propagules thereof. Prohibited plant species include all species listed in the most current version of the Alaska Center for Conservation Science’s “Non-Native Plant Species List” as well as any other species deemed by the Contracting Officer to be potentially invasive.

2. Request inspections of material sources a minimum of 30 calendar days prior to need for soil or aggregate delivery to the project site. Inspections can only be performed during snow-free conditions. Include with each request for inspection the following information:

a. Name and physical address of the material source and contact information of the soil and aggregate Source Operator

b. Description of type and quantity of each type of soil or aggregate material proposed for incorporation in the project

c. Description of proposed location where each soil or aggregate material will be used within the Park

d. Map or annotated aerial photograph of the proposed soil and aggregate material source area. Identify property boundaries, extraction, processing and storage locations, and known locations of prohibited plant populations discovered during previous inspections, if any

e. A written description of the material source operator’s invasive species control plan, if any

f. Copies of previous prohibited plant inspection certificates, if any

3. Upon receipt of inspection request, the Contracting Officer will schedule inspection with the Contractor. The Contractor’s on-site project quality control representative must attend the inspection.

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4. The Contracting Officer’s inspection will include all areas within and surrounding the material source which may have potential to contribute prohibited plants, seeds, or propagules to the soil or aggregate products being produced.

5. Within seven calendar days of completing inspection, the Contracting Officer will provide a written inspection report.

a. If no prohibited species or viable seeds or propagules are found, the Contracting Officer will certify the source, and material from the source may be incorporated into the project. Certification is valid for the growing season (June through October) during which the inspection occurs through the start of the following growing season (June of the year following the inspection).

b. If prohibited plants are found, the report will indicate types and locations, and the material source will not be certified as suitable for use. At the Contracting Officer’s sole discretion, the report may provide suggested mitigation measures that the source operator or Contractor could undertake to eliminate or render any prohibited plants, seed, or propagules found on site non-viable. Completion of any suggested mitigation measures is at the sole discretion of the Contractor or Source Operator and does not guarantee future certification.

6. Requests for reinspection of a source previously inspected but not certified by the Contracting Officer will only be granted upon receipt of certification by the Source Operator that they have completed mitigation measures to eradicate prohibited plants and the source has since been certified weed-free by a third-party inspector working for the Fairbanks Soil Conservation District or the State of Alaska in accordance with the North American Invasive Species Management Association’s (NAISMA) “Certified Weed-Free Gravel” standard. Third-party weed-free certification does not guarantee certification by the Contracting Officer.

7. At all stages during storage, handling, transport, and placement of certified soil and aggregate materials, incorporate best management practices (BMPs) to prevent contamination with prohibited plants. Any materials found to be contaminated upon delivery of the site will be rejected and must be completely and promptly removed from Park property.

8. The restrictions above do not apply to aggregates used in concrete or asphalt which are batched outside the boundaries of the Park prior to delivery.

DENALI NATIONAL PARK AND PRESERVE, ALASKA

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PART 3 EXECUTION

3.1 PREPARATION

A. Protect and maintain benchmarks and survey control points from disturbance during construction.

B. Protect adjacent and adjoining areas from hydroseeding and hydromulching overspray.

C. Protect existing site improvements to remain from damage during construction.

1. Restore damaged improvements to their original condition, as acceptable to Government.

3.2 TEMPORARY EROSION AND SEDIMENTATION CONTROL

A. Provide temporary erosion- and sedimentation-control measures to prevent soil erosion and discharge of soil-bearing water runoff or airborne dust to adjacent properties and walkways, according to erosion- and sedimentation-control Drawings and requirements of authorities having jurisdiction.

B. Maintain, inspect, and repair erosion- and sedimentation-control measures during construction until permanent vegetation has been established.

C. Remove erosion and sedimentation controls, and restore and stabilize areas disturbed during removal.

3.3 CLEARING

A. All equipment to be used on roof must be preapproved by Contractor Engineer to ensure roof load requirements.

B. Contractor to cut and remove above ground stems, leaves and all plants currently on roof.

Chip vegetation to a maximum particle size of 1 inch. Mix chipped material with salvaged soil from roof before stockpiling. All roots are to remain within the salvaged tundra soil.

3.4 STOCKPILE

A. Contractor to coordinate with NPS on stockpiling locations in designated staging areas.

Ensure site is clear of invasive plants and not located on existing tundra plants.

B. Stockpile to be no more than 6’ in height. Contractor to cover tundra soil with a light-colored breathable landscape fabric until installation. Maintain moisture content and ensure tundra soil does not dry out or stays moist.

C. Avoid compacting tundra soil by limiting the use of heavy equipment on stockpiles.

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3.5 INSTALLATION

A. Additional material source to be approved by NPS. Possible local location at Mile 70 pit.

1. No soil to be sourced from Mile 0 to 25 on the Denali Park Road.

2. All supplementary soil from outside Denali National Park, must be certified weed-free by NPS prior to bringing to site location.

B. Contractor to mix salvaged tundra soil with a mineral substrate that is approved by NPS and spread tundra soil to a minimum depth of 16 inches across new roof area.

C. Contractor to prepare roof for seeding, compaction of tundra soil is not permitted, tundra soil to be raked to desired grading. Minimize compaction during installation by using tundra tracks on small, preapproved equipment or hand tools. Orient tracks or furrows to be perpendicular to the slope to minimize erosion.

3.6 HYDROSEEDING INSTALLATION

A. Hydroseeding: NPS will be responsible for seeding and fertilization of tundra on new roof after contractor has graded tundra soil. Mix specified seed, controlled-release fertilizer, and fiber mulch in water, using equipment specifically designed for hydroseed application. Continue mixing until uniformly blended into homogeneous slurry suitable for hydraulic application.

1. Water prepared, dry, tundra soil surface to ¼ inch.

2. Mix slurry with nonasphaltic tackifier.

3. Spray-apply slurry uniformly to all areas to be seeded in a two-step process. Apply first slurry coat at a rate so that mulch component is deposited at not less than 500-lb/acre dry weight, and seed component is deposited at not less than the specified seed-sowing rate. Apply slurry cover coat of fiber mulch (hydromulching) at a rate of 1000 lb/acre.

B. Contractor to maintain and water the tundra soil and seed until project is turned to the Government.

3.7 DISPOSAL OF SURPLUS AND WASTE MATERIALS

A. Remove surplus soil material, rock, unsuitable soil, demolished materials and dispose of at location to be identified by the Government. All Contractor generated waste materials including trash and debris shall be removed from the site for legal disposal.

DENALI NATIONAL PARK AND PRESERVE, ALASKA

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END OF SECTION